body {
    width: 100%;
    min-width: 320px;
    max-width: 640px;
    /* 居中对齐 */
    margin: 0 auto;
    /* 常用样式 */
    background: #fff;
    font-size: 14px;
    font-family: -apple-system,Arial, Helvetica, sans-serif;
    line-height: 1.5;
    color: #666;

}

* {
    -webkit-tap-highlight-color: transparent;
}
input {
    -webkit-appearance: none;
}

         /* 禁用长按页面的弹出菜单 */
img,a {
            -webkit-touch-callout: none;
}
a {
    color: #666;
    text-decoration: none;
}
ul {
    margin: 0;
    padding: 0;
    list-style: none;
}
img {
    vertical-align: top;
}

.app {
    height: 45px;
}

.app ul li {
    float: left;
    height: 45px;
    background-color: #232326;
    text-align: center;
    line-height: 45px;
    color: #fff;
    font-style: normal;
}

.app ul li:nth-child(1) {
    width: 8%;

}

.app ul li:nth-child(1) img {
    width: 16px;
    height: auto;
    /* 图片文字居中对齐 */
    vertical-align: middle;
}

.app ul li:nth-child(2) {
    width: 10%;

}

.app ul li:nth-child(2) img {
    width: 35px;
    vertical-align: middle;

}



.app ul li:nth-child(3) {
    width: 57%;
    float: left;

}
.app ul li:nth-child(3) span {
    display: block;
    position: relative;
    font-size: 12px;
    margin-top: 7px;
}

.app ul li:nth-child(3) span em:nth-child(1) {
    color: #fff;
    font-weight: 500;
    position: absolute;
    top: -9px; 
    left: 5px;
    font-style: normal;
}
.app ul li:nth-child(3) span em:nth-child(2) {
    color: #999;
    position: absolute;
    font-style: normal;
    top: 9px;
    left: 5px;
}

.app ul li:nth-child(4) {
    width: 25%;
    background-color: #CD2525;
}


/* 搜索区域css */
.search-wrap {
    position: fixed;
    width: 100%;
    min-width: 320px;
    max-width: 640px;
    height: 44px;
    overflow: hidden;
}

.search-bth {
    position: absolute;
    top: 0;
    left: 0;
    width: 40px;
    height: 44px;
}
.search-bth::before {
    content: "";
    display: block;
    width: 20px;
    height: 18px;
    background: url(../images/leftbth.png) no-repeat;
    background-size: 20px 18px;
    margin: 14px 0 0 15px;
}


.search {
    position: relative;
    height: 30px;
    background-color: #fff;
    margin: 0 50px;
    border-radius: 15px;
    margin-top: 7px;
}

.jd-icon {
    width: 20px;
    height: 15px;
    position: absolute;
    top: 8px;
    left: 13px;
    background:url(../images/jd.png) no-repeat;
    background-size: 20px 15px;
}
.jd-icon::after {
    position: absolute;
    right: -10px;
    top: 0;
    content: "";
    display: block;
    width: 1px;
    height: 15px;
    background-color: #ccc;
}

.sou {
    position: absolute;
    top: 8px;
    left: 50px;
    width: 18px;
    height: 15px;
    background-color: pink;
    background: url(../images/jd-sprites.png) no-repeat -81px 0;
    background-size: 200px auto;
}
.search input {
    position: absolute;
    box-sizing: border-box;
    right: 50px;
    top: 7px;
    background-color: #fff;
    border: 0;
    vertical-align: middle;
    line-height: 16px;
    font-size: 12px;
    color: #232326;
    margin: 0 0 0 5px;
    text-overflow: ellipsis;

}
.search-login {
    position: absolute;
    top: 0;
    right: 0;
    width: 40px;
    height: 44px;
    padding-left: 5px;
    color: #fff;
    line-height: 44px;
}


/* 主体区域 */
.slider img {
    width: 100%;
}
/* 品牌日 */

.brand {
    overflow: hidden;
    background-color: #fff;
    border-radius: 10px 10px 0 0  ;
}
.brand div {
    float: left;
    width: 33.33%;
}

.brand div img {
    width: 100%;
}


/* nav区域 */
nav {
    padding-top: 5px;
}
nav a {
    float: left;
    width: 20%;
    text-align: center;

}

nav a img {
    width: 40px;
    margin: 10px 0;
}

nav a span {
    display: block;
}

